聚硼硅氮烷先驱体的合成及其目标陶瓷SiBNC的性能冰  

Performance of polyborosilazane and SiBNC ceramics thereof

作　　者：唐云[1] 王军[1] 李效东[1] 王浩[1] 商遥[2] 

机构地区：[1]国防科技大学CFC国防科技重点实验室,长沙410073 [2]防化指挥工程学院,北京100000

出　　处：《材料研究学报》2008年第3期291-296,共6页Chinese Journal of Materials Research

基　　金：国防基础科研资助项目A2820060068;国家自然科学基金50702075资助项目~~

摘　　要：以三氯化硼、甲基氢二氯硅烷、六甲基二硅氮烷为起始原料,通过共缩合路径合成了SiBNC陶瓷先驱体-聚硼硅氮烷(PBSZ),将PBSZ在氨气气氛中高温热解可得SiBNC陶瓷.对先驱体及其陶瓷产物的组成、结构和高温结晶性能进行了研究.结果表明,先驱体的骨架结构为-Si-N-B-,其中,B、N以硼氮六环形式存在.1000℃的陶瓷产率为61%,陶瓷中碳含量低于0.5%,具有较好的热稳定性能,能够在1700℃以上保持非晶,在1850℃部分结晶,主要由Si_3N_4、BN和少量SiC组成,1500℃-1850℃间质量损失约为10%.Polyborosilazane （PBSZ）, a precursor to SiBNC ceramic, was synthesized via a one-step condensation reaction using dichloromethylsilane, boron trichloride and hexamethydisilazane as the starting materials. Pyrolysis of the as-synthesized PBSZ in NH3/N2 atmosphere at 1000℃ led to SiBNC ceramics with a yield of 61% and low carbon content （〈0.5%）. The structure and high temperature performance of PBSZ and the corresponding ceramics were investigated in details. The backbone of PBSZ is mainly composed of --Si--N--B-- with some borazine rings. The resulted ceramic shows excellent thermal stability with mass loss of 10% at 1500-1850℃ in nitrogen atmosphere. In addition, the ceramic remains an amorphous state up to 1700℃ and results in small amount of Si3N4, BN and SiC crystallites when heated to 1850℃, which makes it a potential candidate material for the high temperature resistant wavetransparent application.

关 键 词：无机非金属材料 SiBNC陶瓷 聚硼硅氮烷 先驱体转化法 陶瓷先驱体 非晶陶瓷 

分 类 号：TQ174[化学工程—陶瓷工业]